检索结果-内蒙古大学图书馆

作者： Songping Yang Ranni Zhang Yongyi Chen Fan Yang He Wang Ru Zhang Packaging Engineering Institute Jinan University MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University School of Marxism Jinan University School of Intelligent Science and Engineering Jinan University Electrical Engineering Institute Jinan University School of Electrical Engineering Jinan University International Business School Jinan University

Since markov chain is widely used in various fields, the relevant literatures of markov chain theories are analyzed base on CiteSpace in this paper, adopting 10,000 literatures in CNKI and 10,000 literatures in WOS as datas. The relationship among markov chain, monte carlo integral and bayesian theory is analyzed primarily. What's more, the hidden markov model, markov random field, markov decision process and grey-markov model derived from markov chain are investigated emphatically. Ultimately, we reviews the development history of markov chain, makes a visual analysis of the authors, sorts out the research status of markov chain, and makes a comprehensive review of the application of markov chain.

关键词： Visualization Monte Carlo Citespace

来源：评论

学校读者我要写书评

暂无评论

Nonlinear stability of sensor elastic element--corrugated shallow spherical shell in coupled multi-field

引用

Applied Mathematics and Mechanics(English Edition) 2017年第6期38卷 877-888页

作者： Yongan ZHU Fan WANG Renhuai LIU Institute of Applied Mechanics Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering of Ministry of Education Jinan University Guangzhou 510632 China

Nonlinear stability of sensor elastic element- corrugated shallow spherical shell in coupled multi-field is studied. With the equivalent orthotropic parameter obtairled by the author, the corrugated shallow spherical shell is considered as an orthotropic shallow spherical shell, and geometrical nonlinearity and transverse shear deformation are taken into account. Nonlinear governing equations are obtained. The critical load is obtained using a modified iteration method. The effect of temperature variation and shear rigidity variation on stability is analyzed.

关键词： modified iteration method corrugated shallow spherical shell multi-field,stability critical load temperature variation

来源：评论

学校读者我要写书评

暂无评论

An explicit high-efficiency algorithm for simulating high-cycle fatigue behavior of metals

引用

IOP Conference Series: Materials Science and engineering 2020年第1期770卷

作者： S Y Wang L Zhan Z H Xu H F Xi H Xiao School of Mechanics & Construction Engineering and MOE Lab for Disaster Forecast & Control in Engineering Jinan University West Huangpu Avenue 601 510632 Guangzhou China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University 710049 Xi'an China

This article presents a direct and efficient algorithm for simulating high-cycle fatigue failure effects within the framework of a recently proposed elastoplastic model, in which fatigue failure effects of metals are incorporated as inherent constitutive features. Toward bypassing very time-consuming procedures in conducting numerical integrations of the elastoplastic rate equations for extremely large number of loading cycles, from the new model it is possible to derive an explicit expression for the fatigue life directly in terms of the stress amplitude. Numerical examples show that the new algorithm thus established is much more efficient than usual direct numerical procedures and that is particularly the case in simulating fatigue failure effects with very high cycle number.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A unified simulation of low-to-high cycle fatigue failure effects for metals with efficient algorithm

引用

IOP Conference Series: Materials Science and engineering 2020年第1期770卷

作者： L Zhan S Wang Z H Xu H F Xi H Xiao School of Mechanics & Construction Engineering and MOE Lab for Disaster Forecast & Control in Engineering Jinan University West Huangpu Avenue 601 510632 Guangzhou China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University 710049 Xi'an China

Within the framework of a recently established elastoplasticity model incorporating fatigue failure effects into inherent response features, a new and efficient algorithm is proposed to simultaneously treat fatigue failure effects from low to high cycle cases. From the new model it is possible to derive an explicit algorithm with which the accumulated plastic work is directly calculated by means of a recursive scheme, thus bypassing very time-consuming procedures in carrying out numerical integrations of the elastoplastic rate equations for a large number of loading-unloading cycles. Comparisons of simulation results with fatigue failure data from low to high cycle cases are presented to demonstrate the efficacy of the new algorithm.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Innovative elastoplastic J2-flow model incorporating cyclic and non-cyclic failure effects of metals as inherent constitutive features

引用

ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK 2019年第11期99卷

作者： Zhan, Lin Wang, Si-Yu Xi, Hui-Feng Xiao, Heng Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Sch Mech & Construct Engn West Huangpu Ave 601 Guangzhou 510632 Guangdong Peoples R China Shanghai Univ Shanghai Inst Appl Math & Mech Yanchang Rd 149 Shanghai 200072 Peoples R China

A new finite strain elastoplastic J(2)-flow model is proposed toward directly simulating cyclic and non-cyclic failure effects of metals. The main novelties of this model are as follows: The usual notion of yielding is rendered irrelevant in a more realistic sense of representing elastoplastic behaviors of metals up to failure;The thermodynamic consistency requirement from the second law may be identically fulfilled;Failure effects under cyclic and non-cyclic conditions may be automatically incorporated as inherent constitutive features, with involving neither additional variables nor ad hoc failure criteria;Hardening-to-softening effects of metals up to failure may be effectively characterized in a unified manner. (1)(2)(3)(4)Simulation results are provided and compared with experimental data for monotonic and cyclic failure effects for both uniaxial and torsional deformation modes. In particular, both the Swift effects and the failure effects of twisted metal tubes are simultaneously simulated for four cases of finite torsion, including free-end and fixed-end torsion under monotonic and cyclic loadings, and accurate agreement with finite strain data for both torsional modes is accomplished for the first time.

关键词： constrained torsion elastoplasticity finite deformation free torsion metal fatigue simultaneous simulations Swift effect

来源：评论

学校读者我要写书评

暂无评论

Analysis of the Effect of Urban Geometric Form Factors on Heat Islands in Guangzhou

引用

IOP Conference Series: Earth and Environmental Science 2020年第1期555卷

作者： Langtao Zheng Jian Tang Xiong Chen Guangdong Engineering Technology Research Center for Green Building Materials and Fabricated Architecture Maoming P.R. China MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou 510632 China

The geometric form factors of urban space include height width ratio (H/W), sky view factor (SVF) and street direction, which directly affect the incidence of solar radiation, and then affect the temperature change of the block. In this study, the representative hot island and cold island streets in Guangzhou are selected as the research objects. According to the intensity and range distribution map of Guangzhou heat island in summer of 2014-2017 issued by Guangzhou Meteorological Bureau, the intersection area with high intensity of 4-year continuous heat island is found out by two-dimensional image superposition. In the region, the typical measurement points and comparison points are selected in groups, the temperature of each measurement point is monitored, and the urban geometry data is collected for comparative analysis. The results show that under the condition of the same underlying surface factor and no significant difference in artificial heat factor, the urban geometry can alleviate the heat island effect, and the measuring points with smaller sky view factor and larger height width ratio (H/W) have lower temperature, and the temperature of each measuring point has higher correlation with the size of SVF. In addition, the direction defined by the long axis of the valley will also affect the solar radiation equivalent of the street pavement, and the reclamation open land is also easy to become a heat island area.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Study on the Optimum Position of Gas Extraction in Goaf of High Position Borehole Based on CFD

Study on the Optimum Position of Gas Extraction in Goaf of H...

引用

第七届工程管理国际学术研讨会

作者： Baoyong YAN Xiaoze ZHANG Yibin LI Chongqing Research Institute of China Coal Technology and Engineering Group State Key Lab.of Gas Disaster Monitoring and Control as well as Emergency Technology College of Energy and Power Engineering Lanzhou University of Technology

In order to study the effect of gas extraction by high position borehole in goaf, and determine the best position of the borehole, it provides a reference for the selection of gas extraction target location by high position borehole in the future. Based on the goaf of 40113 working face of a mine in Fenxi Group of Shanxi Province, the gas migration model is established. and the gas extraction effect of high position borehole under different target strata is simulated by FLUENT. The results show that the gas concentration in the upper corner of the working face is reduced from 2.3% to 0.7% after using high position borehole to extract gas by compared with the non-extraction situation, which solves the problem of gas concentration exceeding the limit in the upper corner of the working face. When high position borehole of the distance from the floor of goaf is 26 m,and the distance from the level of return air roadway is 25 m, the gas concentration in the upper corner of the working face is 0.58%, and the gas concentration in the hole is the highest and the purity is the largest.

关键词： The Goaf Gas extraction Numerical simulation High position borehole The upper corner

来源：评论

学校读者我要写书评

暂无评论

Thermal-Structural Coupling Analysis of PCBA System 3

Thermal-Structural Coupling Analysis of PCBA System

引用

2018 3rd International Conference on Insulating Materials, Material Application and Electrical engineering, IMMAEE 2018

作者： Su, Wei Zhu, Junhua Liu, Renhuai He, Zhiyuan Scienceand Technol. on Reliability Phys. and Applic. Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Department of Mechanics and Civil Engineering Jinan University Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

In this paper, the thermal and structural analysis of the PCBA system is provided by using the 3-D ANSYS package. The results of thermal and structural analysis for complex and simple model are compared. The paper also describes the deformation analysis of the PCBA system components, and the weak components sensitive to thermal stress are determined though thermal-structual analysis. The results of thermal analysis are helpful to the optimizing overall arrangement design of PCBA system. © Published under licence by IOP Publishing Ltd.

关键词： Thermoanalysis

来源：评论

学校读者我要写书评

暂无评论

Explicit and accurate characterization of hardening- softening behavior of metals up to failure

引用

IOP Conference Series: Materials Science and engineering 2020年第1期770卷

作者： Z H Xu S Y Wang L Zhan H F Xi H Xiao School of Mechanics & Construction Engineering and MOE Lab for Disaster Forecast & Control in Engineering Jinan University West Huangpu Avenue 601 510632 Guangzhou PR China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University 710049 Xi'an PR China

Full and accurate characterization of metal hardening-softening effects till failure is carried out with a new explicit approach. To this purpose, a new expression for the plastic work is presented explicitly in terms of the uniaxial stress-strain function of any given form. Accordingly, the yield strength as function of the plastic work can be determined jointly from the above functions with the axial logarithmic strain as parametric variable. Using the proposed approach, any test data obtained within the entire stress-strain range with hardening and softening portions up to failure can be fitted by directly treating a suitable form of the uniaxial stress-strain function. This allows one to bypass usual tedious trial-and-error numerical procedures in dealing with nonlinear elastoplastic rate equations for identifying numerous unknown parameters. Accurate simulation results are shown with numerical examples.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Reliability sensitivity analysis using axis orthogonal importance Latin hypercube sampling method

引用

ADVANCES IN MECHANICAL engineering 2019年第3期11卷

作者： Zhao, Wei Chen, YangYang Liu, Jike Jinan Univ Key Lab Disaster Forecast & Control Engn Minist Educ China Guangzhou 510632 Guangdong Peoples R China Guangzhou Univ Earthquake Engn Res & Test Ctr Guangzhou Guangdong Peoples R China Sun Yat Sen Univ Dept Mech Guangzhou Guangdong Peoples R China

In this article, a combined use of Latin hypercube sampling and axis orthogonal importance sampling, as an efficient and applicable tool for reliability analysis with limited number of samples, is explored for sensitivity estimation of the failure probability with respect to the distribution parameters of basic random variables, which is equivalently solved by reliability sensitivity analysis of a series of hyperplanes through each sampling point parallel to the tangent hyperplane of limit state surface around the design point. The analytical expressions of these hyperplanes are given, and the formulas for reliability sensitivity estimators and variances with the samples are derived according to the first-order reliability theory and difference method when non-normal random variables are involved and not involved, respectively. A procedure is established for the reliability sensitivity analysis with two versions: (1) axis orthogonal Latin hypercube importance sampling and (2) axis orthogonal quasi-random importance sampling with the Halton sequence. Four numerical examples are presented. The results are discussed and demonstrate that the proposed procedure is more efficient than the one based on the Latin hypercube sampling and the direct Monte Carlo technique with an acceptable accuracy in sensitivity estimation of the failure probability.

关键词： Latin hypercube sampling Halton axis orthogonal importance sampling spurious correlation reduction parameter sensitivity structural reliability

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：